.submit-btn {
    text-align: center;
    display: flex;
    justify-content: center
}

#文字标题 {
    font-size: 25px;
    margin-top: 5px;
    margin-left: 20px
}


body {
    display: flex;
    justify-content: center;
    align-items: center
}

#codeImg {
    margin-left: -15px;
    width: 85px;
    height: 38px;
    cursor: pointer;
}

#login-name-check {
    color: red;
}